When will they size up?
Babies grow into the next size faster than you'd think. Here's a rough guide to when, from your baby's weight.
Tell us about your baby
Two answers is all it takes - every tool on the page reads it from here.
Girl or boy?The WHO growth charts are different for each, so percentiles need it.
Add weight, height and more
What we work out
Your baby
Age appears here
- Diaper size
- Add a weight
- Diapers a day
- Add a birthday
- Vaccinations due now
- Add a birthday
Add a date of birth to see this fill in.
Stays on this device. Sign in to keep it on your account instead, or skip it and use the tools directly.
One email with a care plan and the upcoming vaccination dates. We keep the address so we can send it, and nothing else.
When will they size up?
We follow your baby's own growth curve, not an average one - so a bigger baby gets a sooner answer and a smaller one a later answer.
Enter a weight to see the current size.